Freescale Semiconductor MMDS0508 manual Time Tag Clock Setup, Clock Frequency

Freescale Semiconductor, Inc.

MMDS Target Component

4.10 Bus Analyzer

4.10.2.8 Time Tag Clock Setup

Each frame of the trace buffer includes a time reference value, or time tag. You can specify the clock signal that the analyzer uses for these time tags. To do so, choose the Trace>Setup... menu selection, to open the Bus Analyzer Configuration dialog box as shown in Figure 4.19. Then click on the Time Tag Clock tab.

Figure 4.19 Bus Analyze Time Clock Setup

4.10.2.8.1 Clock Frequency

In the Time Tag Clock Frequency area, select the clock-frequency source: an internal oscillator at 16, 8, 4, 2, or 1 Mhz; an external clock; a bus clock; or a programmable clock. In general, the faster clock rates provide higher resolution, so are appropriate for faster emulator clock rates.

If you specify a programmable clock, you must enter the Hz frequency, 50 to 50,000, in the edit box. If you specify a Nominal value, the analyzer uses the closest, Actual frequency value. (A nominal value is a non-integer quotient of dividing 500,000 Hz by an integer. An actual value is an integer quotient of dividing 500,000 Hz by an integer. For example, suppose that you specify 986 in the edit box. 500,000 divided by the integer 507 yields the non-integer quotient 986.193. If you specify a nominal value, the analyzer rounds this value up to 1000, which is the integer quotient of 500,000 divided by 500.)

To save your time tag clock settings, and close the dialog box, click the OK button.

MMDS0508 Target Interface 4–45

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